5'-O-(4,4'-dimethoxytrityl)-6-N-[N-(trans-4-levulinyloxycyclohexyl)carbamoyl]-2'-O-methyladenosine 、
2-氰乙基N,N-二异丙基氯亚磷酰胺 在
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 6.0h,
以73%的产率得到5'-O-(4,4'-dimethoxytrityl)-6-N-[N-(trans-4-levulinyloxycyclohexyl)carbamoyl]-2'-O-methyladenosine 3'-(2-cyanoethyl N,N-diisopropylphosphoramidite)